Information processing apparatus

ABSTRACT

Thumbnail images are promptly created while reducing the required memory capacity for storing the thumbnail images. When input (of an image or a command) is not completed in more than a prescribed time period, only the picture images photographed on that day from among the photo-images stored in a memory are read to create thumbnail images. The created thumbnail images are stored in a buffer memory. When set to the reproduction mode, the thumbnail images stored in the buffer memory are read and displayed on a screen in a list format. Furthermore, when the power is in the OFF position, the thumbnail images stored in the buffer memory can be deleted.

INCORPORATION BY REFERENCE

[0001] The disclosure of the following priority application is hereinincorporated by reference: Japanese Patent Application No. 8-270798,filed Oct. 14, 1996.

BACKGROUND OF THE INVENTION

[0002] 1. Field of Invention

[0003] The present invention relates to an information processingapparatus, and in particular to an information processing apparatus thatphotographs a photographic object and has the ability to record it as apicture image as well as reproduce the recorded picture image.

[0004] 2. Description of Related Art

[0005] Conventional electronic cameras can, for example, reproduce aphotographed image (hereafter abbreviated as photo-image). Typically,the photo-images are displayed in the order that they were photographed.

[0006] However, with this type of reproduction method, since the orderthat the photo-images can be reproduced is fixed, there is the problemthat it is impossible to select and reproduce photo-images at one's owndiscretion. Therefore, when reproducing a photo-image, the photo-imageis reduced by a prescribed ratio thereby creating a reduced image(hereafter referred to as a thumbnail image). A plurality of thumbnailimages can then be displayed in a list format on the screen. Further, byallowing the user to select from the thumbnail images according to thedesire of the user, the reproducing of photo-images at one's discretioncan be achieved.

[0007] However, since photo-images are formed of a plurality of pixeldata, various processes are required to create a thumbnail image from aphoto-image. Accordingly, there is the problem that a large amount oftime is required in order to create each thumbnail image.

[0008] Therefore, for example, a thumbnail image can be generated eachtime photography is performed, and by storing each thumbnail image inmemory, the trouble of repeatedly generating the thumbnail image can beavoided. However, with this type of method, since a portion of memorythat stores the photo-image is occupied by the thumbnail image, there isthe problem that the number of photo-images that can be recorded arelimited.

[0009] In addition, the following problem can occur when attempting togenerate a thumbnail image upon each occurrence of photography even withsufficient memory. With the so-called successive photo mode, in which aseries of photo-images are successively taken, it is desirable to havethe most number of photos taken within a given time period. However, ifa thumbnail image was generated upon the imaging of each frame (i.e.,each photo-image) of photography, the speed of successive photographywould decrease, thereby creating a problem.

[0010] In addition, even if a thumbnail image is generated upon eachframe of photography without limiting successive photography, theresponse of the device to the operation of the user will be slow.

SUMMARY OF THE INVENTION

[0011] The present invention takes into consideration the abovecircumstances and makes it possible to reduce the time required togenerate thumbnail images as well as to reduce the area of memoryoccupied by thumbnail images.

[0012] Further, the present invention makes it possible to operate inthe successive photo mode without decreasing the successive photographyspeed, and makes photography possible without slowing the response ofthe device.

[0013] According to one aspect of the invention, an informationprocessing apparatus includes a memory in which picture images ofphotographic objects are recorded and a thumbnail image generator thatreduces by a prescribed ratio the picture image recorded in the memory,thereby creating the thumbnail image. A controller controls thethumbnail image generator. A display device displays the thumbnailimages created by the thumbnail image generator.

BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The invention will be described in conjunction with the followingdrawings in which like reference numerals designate like elements andwherein:

[0015]FIG. 1 is a perspective view of a front of an electronic cameraaccording to one embodiment of the present invention;

[0016]FIG. 2 is a perspective view of the rear of the electronic camerashown in FIG. 1;

[0017]FIG. 3 shows the inner components of the electronic camera shownin FIG. 1 and FIG. 2;

[0018]FIG. 4 is a block diagram of the electronic camera shown in FIG. 1and FIG. 2;

[0019]FIG. 5 is a figure describing the process for thinning the pixelswhen the camera is in the L mode;

[0020]FIG. 6 is a figure describing the process for thinning the pixelswhen the camera is in the S mode;

[0021]FIG. 7 is one example of the display screen when reproducing therecorded information;

[0022]FIG. 8 shows one example of the audio and image recorded history;

[0023]FIG. 9 is a flow chart describing one example of a process thatcreates and displays one screen worth of thumbnail images;

[0024]FIG. 10 is a flow chart describing one example of a process thatexecutes scrolling for the display screen displayed by the process inFIG. 9;

[0025]FIG. 11 shows one example of the display subsequent to executingscrolling by the process shown in FIG. 10;

[0026]FIG. 12 is a flow chart describing one example of a process thatcreates a thumbnail image when the input of an image has not beencompleted within a prescribed time period;

[0027]FIG. 13 is a flow chart describing one example of a process thatdisplays the thumbnail image that is created by the process in FIG. 12;

[0028]FIG. 14 is a flow chart describing a process that deletes thethumbnail image when the power switch is in the OFF position; and

[0029]FIG. 15 is a flow chart of a process used to generate thumbnailimages in the successive photography mode.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

[0030] An embodiment of the present invention is explained hereafterwith reference to the figures.

[0031]FIGS. 1 and 2 show the composition of one embodiment of anelectronic camera 1 according to the present invention. With theelectronic camera of the present embodiment, when photographing anobject, the side facing the photographic object is designated as X1, andthe side facing the user is designated as X2. Provided on the upper endof the side X1 are a viewfinder 2, which is used to confirm thephotographic range of the object, a photographic lens 3, which takes inthe photo-image of the photographic object, and a light emittingcomponent (a strobe lamp) 4, which emits light when illuminating thephotographic object.

[0032] On the upper end (the portion having the viewfinder 2, thephotographic lens 3 and the light emitting component 4 of the X1 side)of the side X2 opposing the X1 side, is a speaker 5, which outputs soundthat is recorded in the electronic camera 1, as well as the viewfinder2. In addition, a LCD 6 and operation keys 7 (menu key 7A, execution key7B, clear key 7C, cancel key 7D, and scroll keys 7E-A, 7E-B, 7E-C and7E-D), are formed on the X2 side, directly below the viewfinder 2, thephotographic lens 3, the light emitting component 4, and the speaker 5.A touch tablet 6A is provided on the surface of the LCD 6. Whencontacted, for example, by a pen-shaped indicator to be describedhereafter, the touch tablet 6A outputs the position data thatcorresponds to the indicated position.

[0033] The touch tablet 6A is formed of transparent materials such asresin or so forth. Thus, the user, through the touch tablet 6A, canobserve the image that is displayed on the LCD 6, which is formed belowthe touch tablet 6A.

[0034] The operation keys 7 are operated when the recorded data is to bereproduced and displayed in the LCD 6. More specifically, the menu key7A is operated when displaying the menu screen on the LCD 6. Theexecution key 7B is operated when reproducing the recorded informationselected by the user. The clear key 7C is operated when clearing therecorded information. The cancel key 7D is operated when canceling thereproduction process of the recorded information. The scroll keys areoperated when scrolling the screen in the up and down directions whenthe list of recorded information is displayed on the LCD 6. The scrollkeys include the line scroll up key 7E-A and the line scroll down key7E-B which scrolls either 1 line or units of multiple lines. The pagescroll up key 7E-C and the page scroll down key 7E-D scroll in units ofpages.

[0035] The Z side, which is the top side of the electronic camera 1,includes an audio microphone 8, which collects audio sound, and anearphone jack 9, where earphones not shown in the figure are connected.

[0036] The left side (the Y1 side) includes a release switch 10, whichis operated when photographing an object, a power switch 11, and an ACadapter jack 15 for connecting to an AC adapter.

[0037] Meanwhile, the Y2 side (the right side), which opposes the Y1side, includes an audio recording switch 12, which is operated whenrecording audio sound, and a successive photo mode switch 13, which isoperated when switching to the successive mode of photography.Preferably, the audio recording switch 12 is formed at nearly the sameheight as the release switch 10 on the Y1 side, thereby allowing acomposition that does not provide discomfort when held from either theleft or right. The height of the audio recording switch 12 and of therelease switch 10 can also be different in order to prevent erroneouspressing of the switch arranged on the opposite side of the finger usedto off-set the moment of pressing force when pressing one switch.

[0038] The successive photo mode switch 13 is used when setting betweeneither photography of one frame of an object or photography of apredetermined number of frames when the user photographs an object bypressing the release switch 10. For example, when the indicator of thesuccessive photo mode switch 13 is switched to the position where the[S] is printed (in other words, switched to the S mode), only one frameof photography occurs when pressing the release switch 10. Further, whenthe indicator of the successive photo mode switch 13 is switched to theposition where the [L] is printed (in other words, switched to the Lmode), 8 frames per second (in other words, low speed successive mode)of photography are performed during the time that the release switch 10is pressed. In addition, when the indicator of the successive photo modeswitch 13 is switched to the position where the [H] is printed (in otherwords, switched to the H mode), 30 frames per second (in other words,high speed successive mode) of photography are performed during the timethat the release switch 10 is pressed.

[0039] Next, some of the inner components of the electronic camera 1will be explained referring to FIG. 3. A CCD 20 is provided on the X2side of the photographic lens 3. A photo-image of the object is formedthrough the photographic lens on the CCD 20, the photo-image undergoingphotoelectric conversion to an electric signal therein.

[0040] Batteries (e.g., four dry cell type 3 batteries) 21 are arrangedvertically beneath the LCD. The electrical power generated by thesebatteries 21 is supplied to the various parts of the apparatus. Further,the condenser 22, which accumulates the electric load for emitting thelight emitting component 4, is arranged vertically next to the batteries21.

[0041] The various types of control circuits for controlling eachcomponent of the electronic camera 1 are formed on a circuit board 23.In addition, in between the LCD 6 and the batteries 21, a removablememory card 24 (which functions as a recording means) is arranged. Thevarious types of information input into the electronic camera 1 isrecorded on a predetermined area of the memory card 24.

[0042] Although in the present embodiment the memory card 24 isremovable, it may also be arranged so that the memory is on the circuitboard 23 thereby recording each type of information into this memory.Furthermore, the device may also be set up so as to allow the varioustypes of information recorded in the memory (memory card 24) to beoutput to an external personal computer through an interface, not shownin the figure.

[0043] The electrical composition of the inner components of theelectronic camera 1 of the first embodiment is explained hereafter, withreference to FIG. 4. The lens drive circuit 30 is controlled by the CPU36 (which also functions as the thumbnail image generating means andcontrol means). The photographic lens 3 is moved in the optical axisdirection and auto-focus is executed under control by CPU 36. The CCD20, which includes a plurality of pixels, performs the photoelectricconversion of the photo-image formed at each pixel into a picture imagesignal (electronic signal). The CCD drive circuit 39 is controlled bythe digital signal processor (hereafter referred to as the DSP) 33 so asto drive the CCD 20.

[0044] The image processor 31, performs at a predetermined timing,correlated double sampling of the image signals that arephotoelectrically converted by the CCD 20. By way of an auto-gaincontroller, image processor 31 ensures that the signal value of theimage signals that are sampled are at their optimum level. Theanalog/digital converter (hereafter referred to as the A/D converter) 32converts the sampled image signal from the image processor 31 to adigital signal and then supplies it to the DSP 33.

[0045] The DSP 33 performs a prescribed process, to be describedhereafter, on the digitized picture image signal. DSP 33 then suppliesthe signal to the compression/expansion circuit and memory controller(hereafter referred to as the compression/expansion circuit) 34. Thecompression/expansion circuit 34 compresses the picture image signal(hereafter referred to simply as the image data) that is supplied fromthe DSP 33, and stores it in a predetermined area (photo-image recordingarea) of the memory card 24.

[0046] The timer 45 includes the photographic date and time informationinto an information header for the image data, which is recorded in thephoto-image recording area of the memory card 24. (In other words, thephotographic date and time data is attached to (i.e., correlated to) theimage data recorded in the photo-image recording area of the memory card24.)

[0047] The microphone 8 inputs audio (sound), converts it to acorresponding electric signal, and then supplies it to the audio IC(integrated circuit) 38. The audio IC 38, in addition to A/D convertingthe input audio signal, performs compression processing by way of, forexample, the ADPCM (Adaptive Differential Pulse Code Modulation)process, and then supplies it to the CPU 36 through the CPU control bus.

[0048] The CPU 36 records the digitized and compressed audio sound datato a prescribed area (audio recording area) of the memory card 24through the CPU control bus. In addition, at that time, the data of thesound recording time and date is recorded to the audio recording area ofthe memory card 24 as audio header information.

[0049] When the predetermined position of the touch tablet 6A iscontacted by the pen-shaped indicator (hereafter abbreviated as pen) 46,which is operated by the user, the CPU 36 reads the X-Y coordinates ofthe position where the touch tablet 6A is contacted, and the coordinatedata (hereafter described as line picture information) is stored in thebuffer memory 35 (which functions as a secondary recording means). TheCPU 36 records the line picture information that is stored in the buffermemory 35, as well as the header information of the line pictureinformation input date and time, to the line picture information area.

[0050] The frame memory 47 (which functions as an output means) recordsthe line picture data that is sent through the CPU control bus therebydisplaying it to the LCD 6. However, the photo-image data thatpreviously was subjected to the compression process is temporarily inputinto the compression/expansion circuit 34, where it is expanded(decompressed) prior to being supplied to the frame memory 47.

[0051] The audio data output from the memory card 24 undergoesdigital/analog conversion (hereafter referred to as D/A conversion) byway of the audio IC 38, and after being converted to an analog signal,is supplied to the speaker 5 where it is output as audio sound.

[0052] The flash lamp (or strobe) drive circuit 41 is controlled by theCPU 36 so as to drive the flash lamp 42, which is provided within thelight emitting component 4. In addition, the red-eye reduction (RER)lamp drive circuit 43 is controlled by the CPU 36 so as to drive thered-eye reduction lamp 44, which is provided within the light emittingcomponent 4. The red-eye reduction lamp 44 is illuminated directly priorto the lighting of the flash lamp 42, causing the pupil of the eye ofthe human photographic subject to contract, thereby reducing theso-called red-eye phenomenon in which the eye of the human subjectwithin the photographed picture image appears red.

[0053] The detection circuit 40 converts the voltage of the batteries 21into a corresponding digital signal, and then supplies it to the CPU 36.The CPU 36 can detect the remaining amount of electrical power in thebatteries 21 by way of the digital signal supplied from the detectioncircuit 40.

[0054] Next, various operations of the electronic camera 1 of thepresent embodiment will be explained.

[0055] First, the input and output processes of the audio information ofthe present device will be described.

[0056] After turning ON the power to the electronic camera 1 byoperating the power switch 11, when the sound recording switch 12provided on the Y2 side is pressed, the audio sound recording process(the input process for audio information) is initiated. The audioinformation is input through the microphone 8, and after undergoing A/Dconversion and compression processing by way of the audio IC 38, issupplied to the CPU 36.

[0057] The audio sound that is supplied to the CPU 36 is supplied to thememory card 24 where it is recorded to the audio recording area. At thistime, the sound record date and time data is recorded as headerinformation to the audio recording area of the memory card 24. This typeof operation is performed continuously while the sound recording switch12 is being pressed. While the audio recorded in this case has beencompressed by the ADPCM method, other compression methods may also beused.

[0058] Next, the operation at the time of photographing an object by wayof the present embodiment will be described.

[0059] First, an explanation will be provided concerning the case whenthe successive photo mode switch 13 arranged on the Y2 side is switchedto the S mode (the mode that photographs only one frame at a time).Initially, the power to the electronic camera 1 is turned ON by the useroperating the power switch 11 arranged on the Y1 side. The photographicobject is confirmed through the viewfinder 2, and when the releaseswitch 10 arranged on the Y1 side is pressed, the photography process ofthe object is initiated.

[0060] The photo-image of the photographic object that was observedthrough the viewfinder 2 is collected and image formation occurs on theCCD 20, which includes a plurality of pixels. The photo-image of theobject formed on the CCD 20 is photo-electrically converted to a pictureimage signal at each pixel where a sampling is provided by the imageprocessor 31. The picture image signal sampled by the image processor 31is supplied to the A/D converter 32 where it is digitized and thenoutput to the DSP 33.

[0061] The DSP 33, carries out a process that generates color-differencesignals from the RGB (Red, Green, Blue) signal, and performs a gammaprocess which is a non-linear process. The compression/expansion circuit34 compresses the picture image data that is supplied from the DSP 33according to the JPEG (Joint Photographic Experts Group) method, whichcombines discrete cosine transformation, quantization and Huffmanencoding. Thus, the compressed image is recorded to the photo-imagerecording area of the memory card 24. At this time, the photography dateand time date is recorded to the photo-image recording area of thememory card 24 as the header information of the photo-image data.

[0062] When the successive photo mode switch 13 is switched to the Smode, only one frame is photographed even if the release switch 10 ispressed continuously (i.e., held down for a long time).

[0063] Second, an explanation will be provided for the case when thesuccessive photo mode switch 13 is switched to the L mode (the mode thatphotographs successively 8 frames per second). By operating the powerswitch 11, the power is turned ON to the electronic camera 1, and whenthe release switch 10 is pressed, the photography process of the objectis initiated.

[0064] The photo-image of the photographic object that was observedthrough the viewfinder 2 is collected and image formation occurs on theCCD 20. The photo-image of the object formed on the CCD 20 isphoto-electrically converted to a picture image signal where a samplingat a ratio of 8 times per 1 second is provided by the image processor31. Further, at this time, the image processor 31 samples ¼ of the totalnumber of pixels of the CCD 20.

[0065] In other words, the image processor 31, as shown in FIG. 5,divides the pixels of the CCD 20, which are arranged in a matrix, intoareas (fundamental units) of 2×2 pixels (i.e. 4 pixels). A sampling istaken of the picture image signal for 1 pixel that is arranged in apredetermined position of each area, and the remaining 3 pixels areignored (this is known as a thinning process). For example, at the timeof the first sampling (the first frame), the pixel a of the top left ofeach fundamental unit is selected for sampling while the remainingpixels b, c and d are ignored. At the time of the second sampling (thesecond frame), the pixel b of the top right of each fundamental unit isselected for sampling while the remaining pixels a, c and d are ignored.Thereafter, from the third and fourth times of sampling, the pixel c ofthe bottom left and the pixel d of the bottom right are selected forsampling respectively in turn, and the remaining pixels are ignored. Inother words, each pixel is selected for sampling once in four samplingtimes.

[0066] The picture image signal that is sampled by the image processor31 (i.e. the picture image signal of ¼ of the pixels from the totalnumber of pixels on the CCD 20) is supplied to the A/D converter 32where it is digitized and output to the DSP 33.

[0067] The DSP 33 carries out the aforementioned process on thedigitized picture image signal before outputting it to thecompression/expansion circuit 34. The compression/expansion circuit 34carries out the compression process of the picture image signal based onthe JPEG method, for example, and then records it to the photo-imagerecording area of the memory card 24 through the CPU control bus. Atthis time, the photography date and time data is recorded to thephoto-image recording area of the memory card 24 as header informationof the photo-image data.

[0068] Third, an explanation will be provided for the case when thesuccessive photo mode switch 13 is switched to the H mode (the mode thatphotographs successively 30 frames per second). By operating the powerswitch 11, the power is turned ON to the electronic camera 1, and whenthe release switch 10 is pressed, the photography process of the objectis initiated.

[0069] The photo-image of the photographic object that was observedthrough the viewfinder 2 is collected and image formation occurs on theCCD 20. The photo-image of the object formed on the CCD 20 isphoto-electrically converted to a picture image signal where a samplingat a ratio of 30 times per 1 second is provided by the image processor31. Further, at this time, the image processor 31 samples {fraction(1/9)} of the total number of pixels of the CCD 20.

[0070] In other words, the image processor 31, as shown in FIG. 6,divides the pixels of the CCD 20, which are arranged in a matrix, intofundamental units of 3×3 pixels whereby a sampling is taken at a rate of30 times per 1 second from each area of the picture image electronicsignal for 1 pixel that is arranged in a predetermined position, and theremaining 8 pixels are ignored. For example, at the time of the firstsampling (the first frame), the pixel a of the top left of each area isselected for sampling while the remaining pixels b through i areignored. At the time of the second sampling (the second frame), thepixel b arranged to the immediate right of pixel a is selected forsampling while the remaining pixels a and c through i are ignored.Thereafter, from the third and fourth times of sampling, the pixel c andthe pixel d and so forth are selected for sampling respectively in turn,and the remaining pixels are ignored. In other words, each pixel isselected for sampling every 9 frames.

[0071] The picture image signal sampled by the image processor 31 (i.e.the picture image signal of {fraction (1/9)} of the pixels from thetotal number of pixels on the CCD 20) is supplied to the A/D converter32 where it is digitized and output to the DSP 33.

[0072] The DSP 33 carries out the aforementioned process on the.digitized picture image signal before outputting it to thecompression/expansion circuit 34. The compression/expansion circuit 34,after carrying out the compression process to the picture image signalaccording to the JPEG method, for example, then adds the photographydate and time that is supplied from the timer 45 as header informationand records it to the photo-image recording area of the memory card 24.

[0073] Next, an explanation will be provided of the case when twodimensional line picture information (pen input information) is inputfrom the touch tablet 6A. When the touch tablet 6A is pressed with thepoint of the pen 46, the X-Y coordinates of the point of contact issupplied to the CPU 36. These X-Y coordinates are stored in the buffermemory 35, and the data is written to the location that corresponds toeach point of the X-Y coordinates that are within the frame memory 47.Accordingly, the data is displayed on the LCD 6.

[0074] As described above, since the touch tablet 6A, which is providedon the surface of the LCD 6, is formed out of transparent materials, theuser can view the points (i.e the points of the positions that arepressed upon by the pen tip of the pen 46) that are displayed on the LCD6. This makes it seem as if there is direct pen input on the LCD 6.Further, when moving the pen 46 on the touch tablet 6A, a line whichcorresponds to the movement of the pen 46 is depicted on the LCD 6. Inaddition, if the pen 46 is moved intermittently on the touch tablet 6A,a broken line corresponding to the movement of the pen 46 is displayedon the LCD 6. Thus, the user has the ability to input desired linepicture information such as drawings or letter characters from the touchtablet 6A.

[0075] When the photo-image is displayed on the LCD, the line pictureinformation can be input by the pen 46 thereby causing the line pictureinformation to integrate with the photo-image information in the framememory 47, thereby allowing it to be displayed on the LCD 6. The usercan select the color of the line picture indicated on the LCD 6 fromamong the colors of black, white, red, blue and so forth by operating acolor selection switch, not shown in the figure.

[0076] After inputting the line picture information to the touch tablet6A by way of the pen 46, when the execution key 7B is pressed, the linepicture information stored in the buffer memory 35 is supplied to thememory card 24 through the CPU control bus along with the headerinformation of the input date and time, thereby being recorded to theline picture information recording area.

[0077] The line picture information that is recorded in the memory card24 includes information that has undergone a compression process. Sincethe line picture information that is input into the touch tablet 6Aincludes mainly information having a high spatial frequency content,when performing the compression process by way of the aforementionedJPEG method used in the compression of the photo-image, the compressionefficiency is poor, because the information amount cannot be reduced,the time required for compression and expansion becomes longer. Inaddition, since compression with the JPEG method is lossey, it is notconducive to the compression of line picture information which has onlya small amount of information (this is due to the gathering thataccompanies the lack of information and the blurring that stands outwhen expanding and displaying on the LCD 6).

[0078] Therefore, in the present embodiment, line picture information iscompressed by the run-length method used in faxes and so forth. Therun-length method is a method which scans the line picture surface in ahorizontal direction and encodes each length of continuous colorinformation for each color such as black, white, red, blue and so forth,as well as each length of continuous non-information (the lengths wherethere are no pen inputs) thereby allowing the line picture to becompressed.

[0079] By using the run-length method, effective compression of linepicture information becomes possible. It also becomes possible tocontrol the lack of information even when expanding the line pictureinformation that has been compressed. When the amount of line pictureinformation is comparatively small, it can also be set so as to notcompress.

[0080] As described above, in the case where the photo-image isdisplayed on the LCD 6, when performing pen input, the photo-image dataand the line picture data of the pen input are integrated in the framememory 47. The integrated image of the photo-image and the line pictureis displayed on the LCD 6. Meanwhile, the photo image data is recordedto the photo image recording area and the line information is recordedto the line picture information recording area of the memory card 24. Inthis way, since two forms of information are recorded in respectivelydifferent areas, the user can erase any one of the picture images (forexample the line picture) from the integrated images of the photo-imageand the line picture. Additionally, the user can also compress thevarious image information with individual (different) compressionmethods.

[0081] When setting the camera to the reproduction mode after recordingdata to the audio recording area, to the photo-image recording area, orto the line picture information recording area of the memory card 24, asshown in FIG. 7, a predetermined display is given on the LCD 6. With thedisplay example given in FIG. 7, the date that the information isrecorded (the recording date) (in this case Jun. 30, 1996) is displayedon the upper portion of the screen, and the time of recording theinformation that is recorded on that recording date is displayed in theleft-most edge of the screen.

[0082] A thumbnail image is displayed to the adjoining right of therecording time. This thumbnail image is created by thinning (reducing)the bitmap data for each image of the photo-image data recorded to thememory card 24. The other information displayed with this display is theinformation included with the photo-image. In this display example,photo-image information is included in each of the entries. When thephoto-image was photographed in the L mode or the H mode, one or morepredetermined images (for example the first image) is selected fromamong the plurality of images, and a thumbnail image is created for thepredetermined image.

[0083] The memo-code “*” indicates that a prescribed memo is recorded asline picture data.

[0084] The audio thumbnail is displayed to the right side of the displayarea of the thumbnail image, and a bar (line) indicating the lengthcorresponding to the length of the recorded time is displayed (whenthere is no audio information input, then the bar is not displayed).

[0085] In this display example, the order of display of the thumbnailpicture image and the audio thumbnail and so forth is determined by theorder (in order of time) in which they were recorded to the memory 24.In other words, in the event that a plurality of information is recordedthat cannot be displayed on a single screen, when the display process isperformed on this screen, the oldest recorded information will bedisplayed on the first line, and thereafter, the display will follow inthe order of the oldest recording time (photography date and time oraudio recording date and time). Furthermore, a description of this typeof display method will follow hereafter.

[0086] The user can selectively designate the information to bereproduced by pressing one portion of the desired thumbnail of the LCD 6shown in FIG. 7 with the pen tip of the pen 46. By pressing theexecution key 7B shown in FIG. 2 with the pen tip of the pen 46, theuser can reproduce the selected information.

[0087] For example, when the audio thumbnail displayed on the right sideof the “10:16” shown in FIG. 7 is pressed by the pen 46, the CPU 36reads the audio data corresponding to the selected sound recording dateand time (10:16) from the memory card 24 and supplies it to the audio IC38. The audio IC 38 carries out the expansion process to the audio data(the compressed audio data), and after carrying out the D/A conversionand converting it to an analog signal, it is supplied to the speaker 5.The speaker 5 converts the supplied analog signal to audio sound andoutputs it. When the earphones, not shown in the figure, are connectedto the ear jack 9, the sound is not reproduced through the speaker 5,but is instead reproduced through the earphones.

[0088] When reproducing photo-image data recorded in the memory card 24,the user selects the information by pressing the desired thumbnail imagewith the pen tip of the pen 46, and accordingly, the selectedinformation can be reproduced by pressing the execution key 7B.

[0089] The CPU 36 reads the photo-image data corresponding to theselected photograph date and time from the memory card 24, and it issupplied to the compression/expansion circuit 34. The photo-image data(the compressed photo-image data) supplied to the compression/expansioncircuit 34 is expanded (decompressed) there and output again to the CPU36. The CPU 36, after temporarily storing the photo-image data in theframe memory 47 as bitmap data, displays it on the LCD 6.

[0090] The picture image photographed in the S mode is displayed on theLCD 6 as a static picture image. It goes without saying that this staticpicture image is the reproduced image of the picture image signal of allof the pixels of the CCD 20.

[0091] The picture images photographed in the L mode are displayedsuccessively on the LCD 6 at the rate of 8 frames per second. At thistime, the number of pixels displayed in each frame is ¼ of the totalnumber of pixels of the CCD 20.

[0092] Since human vision is sensitive to the deterioration ofresolution of static picture images, when thinning the pixels of astatic picture image, the user easily detects resolution deterioration.However, with the L mode where the picture images of 8 frames arereproduced per second, the number of pixels for each frame becomes ¼thof the total number of pixels of the CCD. However, as explained above,since the pixels for 8 frames per one second are reproduced, theinformation amount per second becomes twice that of a static pictureimage.

[0093] In other words, if the number of pixels for 1 frame of a pictureimage photographed in the S mode were 1, then the number of pixels for 1frame of a picture image photographed in the L mode would become ¼. Whena picture image (static picture image) that is photographed in the Smode is displayed on the LCD 6, the amount of information entering thehuman eye in 1 second becomes 1 (=(number of pixels 1)×(number of frames1)). Meanwhile, when a picture image that is photographed in the L modeis displayed on the LCD 6, the amount of information that enters thehuman eye in one second becomes 2 (=(number of pixels ¼)×(number offrames 8)). In other words, twice as much information as compared to astatic picture image enters the human eye. Accordingly, even if thenumber if pixels within 1 frame were to be ¼th, when reproduced, theuser does not notice the deterioration of the picture image quality.

[0094] Additionally, with the present embodiment, a sampling is taken ofdifferent pixels for each frame, and since those pixels from thesampling are displayed on the LCD 6, the after-image effect of the humaneye occurs. Accordingly, even if ¾ of the pixels per frame are thinned,the user can view the picture images photographed in the L mode that isdisplayed on the LCD 6 without noticing the deterioration of the pictureimage quality.

[0095] In addition, images photographed in the H mode are displayedsuccessively at a rate of 30 frames per 1 second. At this time, thenumber of pixels displayed for each frame are {fraction (1/9)} of thetotal number of pixels in the CCD 20. However, for the same reason as inthe case of the L mode, the user can view the picture imagesphotographed in the H mode that are displayed on the LCD 6 withoutnoticing the deterioration of the picture image quality.

[0096] In the present embodiment, when photographing an object in the Lmode and in the H mode, since the image processor 31 thins the pixels ofthe CCD 20 to the extent that the deterioration of the picture imagequality is not noticed when reproduced, the load of the DSP 33 and thecompression/expansion circuit 34 can be reduced, enabling thesecomponents to be operated at a low speed and low voltage. In addition,in this way, low cost and low energy consumption of the device can bemade possible.

[0097] Next, the display and creation method of thumbnail imagesapplicable to the present invention will be described.

[0098]FIG. 8 shows the history of picture image and audio recording. Inthis figure, the arrows pointing downward indicate that a picture imagehas been photographed at the point in time indicated by the arrow. Thecircle mark (0) attached to the upper end of an arrow indicates thataudio has been recorded at the same time. These images and sounds arestored respectively in the photo-image recording area and the audiorecording area.

[0099]FIG. 9 is a flow chart that explains an example of the processthat occurs at the time when creating a thumbnail image from a pictureimage recorded in the memory card 24 and displaying it as shown in FIG.7.

[0100] This process is executed when the electronic camera 1 is in thereproduction mode. In other words, when the reproduction mode isselected from among the menu, which is not shown in the figure, when themenu key 7A is pressed by the pen 46, the CPU 36 executes the process ofstep S1.

[0101] The CPU 36, in step S1, assigns to the variable i the content ofthe variable “START.” The value of the variable START depends on thenumbering (the number indicating the order in which items were recordedinto the memory card 24) of the items stored in the memory card 24. Inthe display example shown in FIG. 7, since the picture image V, whichwas photographed on June 30th, is the photo-image that will be processedfirst (because it was the first image recorded on June 30), the ordinalnumber 22 is assigned to the variable “START.” That is, V is thetwenty-second item stored in memory card 24 (A is the first item and Zis the twenty-sixth item in this example—see FIG. 8). Through theprocess of step S1, the value 22 will be assigned to the variable i.

[0102] In step S2, the CPU 36 reads the photo-image data which is in theith position from the memory card 24. Then, flow proceeds to step S3where the photo-image in the ith position is reduced by a predeterminedratio, and the thumbnail image is generated.

[0103] In step S4, the CPU 36, while storing the thumbnail image in thebuffer memory 35, displays it on the LCD 6. As described above, sincei=22, the CPU reads the photo-image data in the 22nd position that isrecorded in the memory card 24, and after reducing it by a predeterminedratio, the thumbnail image is created. Furthermore, while storing theobtained thumbnail image to the buffer memory 35, it is displayed on theLCD 6 along with the photography date and time. The result being, asshown in FIG. 7, that the thumbnail image V corresponding to therecording time (10:05) is displayed.

[0104] Next, the CPU 36, continues to step S5, where it increases thevalue of variable i by 1. In step S6, a determination is made as towhether photo-image data in the ith position exists. If it is determinedto be (YES) that the photo-image data in the ith position exists, thenflow proceeds to step S7. If it is determined to be (NO) that thephoto-image data in the ith position does not exist, then the process iscompleted (END).

[0105] In step S7, a determination is made as to whether the screen isfull. In other words, a determination is made as to whether there existssufficient space to display a new thumbnail image on the LCD 6. Theresult being that, if it is determined to be (YES) that the screen isfull, then the process is completed (END). However, if it is determinedto be (NO) that the screen is not full, then flow returns to step S2 andrepeats a similar process.

[0106] At this time, since i=22, the result of the process in step S5 isthat it now becomes i=23, and in step S6, it is determined to be (YES)that the photo-image data in the 23rd position exists, and thus flowproceeds to step S7. In step S7, if the screen is still not yet full, ajudgment of NO is given, and flow returns to step S2 thereby repeating asimilar process.

[0107] Furthermore, the process as described above is executed for thephoto-image data V through Z, and the result being, as shown in FIG. 7,that the thumbnail images corresponding to the photo-image data of eachof these images are displayed. After completing the process for thephoto-image data Z, in step S6, it is determined to be (NO) thatphoto-image data in the 27th position does not exist thereby ending theprocess (END).

[0108] Furthermore, with the above explanation, in the interest ofsimplification, the explanation of the display process for the audiothumbnail and the memo-codes have been omitted. In addition, with theabove process, START was the point of initiation with creation of thethumbnail image in the order of photography (the order from left toright in FIG. 8). However, it is also, for example, possible to use thepoint of termination (e.g., entry Z) as the initiation point for thecreation of thumbnail images and to proceed in the order from the newestphotography date (the order of right to left in FIG. 8).

[0109] Next, referring to the display screen shown in FIG. 7, adescription of the process for the case when the scroll key 7E ispressed will be given with reference to FIG. 10.

[0110] This process, for example, is executed following the completionof the process shown in FIG. 9. The CPU 36, in step S20, assigns to thevariable t the number (hereafter, this will be abbreviated as the numberof the thumbnail image(s)) of the photo-image that corresponds to thethumbnail image currently displayed at the upper-most line of thescreen. The variable b is assigned the number of the thumbnail imagethat is currently displayed at the bottom-most line of the screen. Thevariable n is assigned the number of thumbnail images newly displayed byone scroll. For example, when making the screen scroll 1 line at a time,the number 1 is assigned to the variable n. In addition, the variable mis assigned the number of thumbnail images capable of being displayed onthe screen at one time.

[0111] In step S21, the CPU determines whether the scroll key 7E hasbeen pressed. If the CPU 36 determines that the line scroll up key 7E-A,which is for scrolling line units in the upward direction (the upperdirection in FIG. 7), has been pressed (1), then flow proceeds to stepS22. If it is determined that the line scroll down key 7E-B, which isfor scrolling line units in the downward direction (the lower directionin FIG. 7), has been pressed (2), flow proceeds to step S27. When theCPU 36 determines that the scroll key 7E has not been pressed (3), thenthe process is completed (END).

[0112] At this time, for example, when the line scroll up key 7E-A forscrolling in the upward direction is pressed, flow proceeds to step S22.In step S22, a determination is made as to whether the photo-image datain the (t−n) position exists. In other words, the number of thumbnailimages newly displayed by 1 scroll are subtracted from the ordinalnumber of the thumbnail image currently displayed on the upper-most lineof the screen. Thus, a determination is made as to whether the pictureimage data of the number corresponding to the obtained value exists.When the result of step S22 is determined to be (YES) that thephoto-image data in the (t−n) position exists, then flow skips theprocess in step S23 and proceeds directly to step S24. When the resultof step S22 is determined to be (NO) that the photo-image data in the(t−n) position does not exist, then flow proceeds to step S23.

[0113] In step S23, since the thumbnail image newly displayed on theupper-most line of the screen subsequent to executing the scroll becomesthat which corresponds to the photo-image data that is in the firstposition, the value (n+1) is substituted for the variable t. In otherwords, when the value (t−n)≦0, the corresponding photo-image data doesnot exist, and therefore, at the processes below step S24, the value of(n+1) is substituted for the variable t so that normal processes can beexecuted. The result being that, for example, at the process of stepS24, to be explained hereafter, the thumbnail image that is created hasthe photo-image data in the first (=t−n=(n+1)−n=1) position as its head.

[0114] In step S24, the thumbnail images are created from thephoto-image data of the (t−n) through the (t−1) positions, and thenstored in the buffer memory 35.

[0115] At this time, n=2 (indicating that 2 lines will be scrolled at atime), and, as shown in FIG. 7, when t=22, b=26, and m=5, thephoto-image in the 20th (=t−n=22−2) position exists, therefore, (YES) isdetermined in step S22 and flow proceeds to step S24. Furthermore, instep S24, the thumbnail images are created from the photo-image data inthe 20th (=t−n=22−2) position and the 21st (=t−1=22−1) position, and isthen stored in the buffer memory 35. These thumbnail images are thosethat are newly displayed on the screen as a result of the scrolloperation.

[0116] In step S25, the thumbnail images in the (t−n) through the(t−n+m−1) positions are displayed. Further, flow proceeds to step S26where the thumbnail images in the (t−n+m) through the (t+m−1) positionsare deleted from the buffer memory 35, and the process is completed(END). At this time, because t=22 as described above, in the process instep S25, the thumbnail images in the 20th (=t−n=22−2) position throughthe 24th (=t−n+m−1=22−2+5−1) position are displayed on the LCD 6 asshown in FIG. 11. In other words, the thumbnail images in the 20th(photo-image T) position and 21st (photo-image U) position, which arenewly stored in the buffer memory 35, and the thumbnail images in the22nd through 24th positions which were stored previously, are alldisplayed on the LCD 6.

[0117] In step S26, the thumbnail images in the 25th (=t−n+m=22−2+5)position and the 26th (=t+m−1=22+5−1) position are deleted from thebuffer memory 35, and the process is completed (END). In other words,the thumbnail images in the 25th position and the 26th position arethose that are deleted from the screen due to the scrolling, andtherefore, these thumbnail images are deleted from the buffer memory 35.

[0118] Next, starting in step S21, a description will be provided of thecase when the line scroll down key 7E-B is pressed. In step S21, when itis determined that the line scroll down key 7E-B has been pressed (2),flow proceeds to step S27. In step S27, a determination is made as towhether the photo-image data in the (b+n) position exists. The resultbeing that, if it is determined to be (YES) that the photo-image data inthe (b+n) position exists, then flow skips the process of step S28, andproceeds directly to step S29. In addition, if the result of step S27 isdetermined to be (NO) that the photo-image data in the (b+n) positiondoes not exist, then flow proceeds to step S28.

[0119] In step S28, as a result of the scrolling, since the thumbnailimage newly displayed at the bottom-most line of the screen is thatwhich corresponds to the last (Nth position) photo-image data, then thevalue (N−n) is assigned to the variable b. In other words, when thevalue (b+n)>N, since the corresponding photo-image data does not exist,the value (N−n) is assigned to the variable b. The result being, forexample, in the process of step S29 that will be explained hereafter,that the thumbnail image that will be created will have the photo-imagedata in the Nth (=b+n=(N−n)+n) position as its tail.

[0120] In step S29, the thumbnail images are generated from thephoto-image data in the (b+1) position through the (b+n) position, andthey are stored in the buffer memory 35. At this time, for example, N=26(referring to FIG. 8), and assume that the thumbnail images in the firstthrough fifth positions are displayed on the screen. In other words,b=5, m=5, and n=2. At this time, when pressing the line scroll down key7E-B, in step S21, it is determined that the line scroll down key 7E-Bhas been pressed (2), and flow branches to step S27.

[0121] In step S27, since photo-image data in the 7th (=b+n=5+2)position exists, it determines YES and proceeds to step S29. In stepS29, the thumbnail image is created from the photo-image data in the 6th(=b+1=5+1) position and the 7th (=b+n=5+2) position, and it is stored tothe buffer memory 35.

[0122] In step S30, the thumbnail images in the (b+n−m+1) positionthrough the (b+n) position are displayed on the LCD 6. Further, flowproceeds to step S31 where the thumbnail images in the (b−m+1) positionthrough the (b+n−m) position are deleted from the buffer memory 35, andthe process is completed (END). At this time, since b=5, in the processof step S30, the thumbnail images in the third (=b+n−m+1=5+2−5+1)position through the seventh (=b+n=5+2) position are displayed. In otherwords, the screen scrolls downward by 2 lines. In addition, it proceedsto the process of step S31 where the thumbnail images in the first(=b−m+1=5−5+1) position and the second (=b+n−m=5+2−5) position aredeleted from the buffer memory 35 and the process is completed (END).

[0123] Next, a description will be provided of the process that occurswhen NO is determined in step S22 or step S27. When the thumbnail imagesin the second through sixth positions are displayed on the screen (i.e.when t=2 and m=5), assume that the line scroll up key 7E-A has beenpressed. At this time, when n=2 (indicating that 2 rows will be scrolledat a time), the result of step S22, is determined to be (NO) that thephoto-image data in the 0th (t−n=2−2) position does not exist, and flowproceeds to step S23. In step S23, the value 3 (=n+1=2+1) is assigned tothe variable t. Then flow proceeds to step S24. In step S24, thethumbnail image is created from the photo-image data in the first(=t−n=3−2) position, and then it is stored in the buffer memory 35.Since the thumbnail image in the second position has already been storedin the buffer memory, the process for the photo-image data in the secondposition will not be executed.

[0124] In the process for step S25, the thumbnail images in the first(=t−n=3−2) position through the fifth (=t−n+m−1=3−2+5−1) position aredisplayed to the LCD 6. Further, in step S26, the thumbnail image in thesixth (=t−n+m=3−2+5) position is deleted from the buffer memory 35. Inthis example, since the thumbnail image in the seventh (=t+m−1=3+5−1)position is not created, the process to delete the thumbnail image inthe seventh position is not executed.

[0125] Next, a description will be provided of the process in the casewhen NO is determined in step S27. When the thumbnail images in the 21stposition through the 25th position are displayed on the screen (i.e.when b=25, m=5, and N=26), assume that the line scroll down key 7E-B hasbeen pressed. At this time, when n=2 (indicating that 2 lines will bescrolled at a time), the result of step S27 is determined to be (NO)that the photo-image data in the 27th (=b+n=25+2) position does notexist. Then flow proceeds to step S28.

[0126] In step S28, the value 24 (=N−n=26−2) is assigned to the variableb, and flow proceeds to step S29. In step S29, the thumbnail image iscreated from the photo-image data in the 26th position, and it is storedin the buffer memory 35. In other words, in the process of step S29, thethumbnail images are created from the photo-image data in the 25th(=b+1=24+1) position through the 26th (=b+n=24+2) position. However,since the thumbnail image in the 25th position has already been created,only the thumbnail image in the 26th position is created.

[0127] In step S30, the thumbnail images in the 22nd (=b+n−m+1=24+2−5+1)position through the 26th (=b+n=24+2) position are displayed on the LCD6. In step S31, the thumbnail image of the 21st (=b+n−m=24+2−5) positionis deleted from the buffer memory 35. In other words, in the process ofstep S31, the thumbnail images in the 20th (=b−m+1=24−5+1) positionthrough the 21st (=b+n−m=24+2−5) position are deleted from the buffermemory 35, and since the thumbnail image in the 20th position does notexist, only the thumbnail image in the 21st position will be deleted,and the process is complete (END).

[0128] According to the process described above, when the electroniccamera 1 is in the reproduction mode, one screen amount of thumbnailimages are created, and while being stored in the buffer memory 35, theyare displayed on the LCD 6. When these thumbnail images are in the stateof being displayed when the scroll key 7E is pressed, thumbnail imagesto be newly displayed on the screen are created due to the scroll, andwhile being stored in the buffer memory 35, they are displayed on theLCD 6. In addition, the thumbnail images canceled from the screen as aresult of the scroll, are deleted from the buffer memory 35.Accordingly, there is always one screen worth of thumbnail images storedin the buffer memory 35.

[0129] In this way, the storage of one screen worth of thumbnail imagesin the buffer memory 35, for example, alleviates the trouble of creatingthumbnail images every time a user returns to the thumbnail displayscreen after (temporarily) moving to another screen (for example, ascreen that reproduces photo-images that correspond to specificthumbnail images).

[0130] Moreover, the thumbnail images that are stored in the buffermemory 35 may also be deleted when changing from the reproduction modeto the recording mode.

[0131] In the embodiment described above, one screen worth of thumbnailimages are created and stored in the buffer memory 35. However, forexample, one screen worth of thumbnail images and thumbnail images thatare newly displayed when scrolling is executed (for example, thumbnailimages of one row worth or one screen worth) may also be created andstored in the buffer memory 35. According to this option, when thescroll key 7E is pressed, the scroll has the ability to be executed verypromptly.

[0132] Furthermore, in the embodiment described above, an explanationwas provided of only the case when scrolling was performed in lineunits, however, by appropriately selecting the value of the variable n,it is possible to execute scrolling by units of screens. In other words,when the page scroll up key 7E-C or the page scroll down key 7E-D ispressed, the value of the variable m is used instead of the variable n(the number n of thumbnail images newly displayed due to one scrollbecomes the number m of the thumbnail images possible to be displayed onone screen), and by executing the process shown in FIG. 10, it becomespossible to execute scrolling by units of pages.

[0133] Next, an explanation will be provided hereafter of anotherembodiment of the present invention. The flow chart shown in FIG. 12 isa flow chart describing a process that creates a thumbnail image wheninput does not occur after a prescribed time period.

[0134] The present process can be executed at every prescribed timeperiod (for example 1 minute) regardless of the selected mode when thepower switch 11 of the electronic camera 1 is in the ON position. Whenthe process of step S50 is executed, the CPU 36 determines whether input(of an image or of any command) occurs after the prescribed time period(for example 1 minute). When the result of step S50 is determined to be(YES) that input has not occurred after the prescribed 1 minute timeperiod, then flow proceeds to step S51. When it is determined to be (NO)that input has occurred, the process is completed (END).

[0135] In the process of step S51, the (identification) number of theimage first photographed after 0:00 AM of that day (the day that theswitch was turned on) is assigned to the variable i. In the next processof step S52, the thumbnail image is created from the photo-image data inthe ith position, and then it is stored in the buffer memory 35. In stepS53, the value of the variable i is increased by 1 increment, and thenflow proceeds to step S54.

[0136] In step S54, a determination is made as to whether thephoto-image data in the ith position exists. The result being that, ifit is determined to be (YES) that the photo-image data in the firstposition exists, then flow returns to step S52 where the similar processis repeated. Further, if it is determined to be (NO) that thephoto-image data does not exist, then the process is completed (END).

[0137] At this time, if an input has not occurred in more than 1 minuteafter turning the power switch 11 to the electronic camera 1 to the ONposition, it will be determined to be YES in step S50, and it willproceed to step S51. For example, if the date the power switch 11 isturned to the ON position is June 30th, and since the first photographedimage taken after 0:00 AM on the morning of June 30th is the photo-imageV (refer to FIG. 8), the ordinal number 22 of this photo-image V will beassigned to the variable i in step S51. Proceeding to step S52, thethumbnail image is created from the photo-image data in the 22ndposition, and then it is stored in the buffer memory 35. Next, in stepS53, the value 22 of the variable i is increased by 1 increment tobecome i=23.

[0138] The result of step S54 is determined to be YES since thephoto-image data in the 23rd position exists. Thus, flow returns to stepS52 to repeat a similar process. The result being that the thumbnailimages for the photo-images in the 22nd position through the 26thposition (photo-image V through Z) are created, and then they are storedin the buffer memory 35.

[0139] With the embodiment described above, from the time that thetemporary processing is initiated until the creation process of thethumbnail image (the processes of steps S52 through S54) is completed,the camera is in a state that will not accept input from the user. Atthis time, however, it is also possible to allow the user to performinput, upon which the creation process of the thumbnail images willtemporarily stop, and when the process for input is completed, thecreation process of the thumbnail images will resume. Furthermore, inthe embodiment described above, the creation of the thumbnail image isperformed in the order from the photo-image with the oldest recordeddate. However, it may also be set up so as to create the thumbnail imagein the order from the photo-image with the newest recorded date.

[0140]FIG. 13 shows a flow chart that describes an example of a processthat displays to the LCD 6 the thumbnail image that was created by theprocess in FIG. 12. This process is executed when the electronic camera1 is set in the reproduction mode.

[0141] In step S70, the CPU 36 makes the initial setting of the variablei to 1. Next, in step S71, the CPU 36 reads the thumbnail image in theith position that is stored in the buffer memory 35, and then displaysit on the LCD 6. Flow proceeds to step S72 where the value of thevariable i is increased by 1 increment. Then, in step S73, adetermination is made as to whether the thumbnail image in the ithposition exists in the buffer memory 35. The result being that if it isdetermined to be (YES) that the thumbnail image in the ith positionexists, then flow proceeds to step S74. If it is determined to be (NO)that the thumbnail image in the ith position does not exist, then theprocess is completed (END).

[0142] In step S74, a determination is made as to whether the screen isfull. The result being that if it is determined to be (YES) that thescreen is full, then the process is completed (END). However, if it isdetermined to be (NO) that the screen is not full, then flow returns tostep S71 where it repeats a similar process.

[0143] At this time, if the thumbnail images for the photo-images in the22nd position through the 26th position (the photo-images V through Z)are stored in the buffer memory 35 as a result of the process in FIG.12, then the process shown in FIG. 13 is executed. In that case, in theprocess of step S71, the thumbnail image in the first position (thethumbnail image for the photo-image V) is read from the buffer memory 35and displayed in the upper-most row of the LCD 6. Further, in theprocess of step S73, it is determined to be (YES) that the thumbnailimage in the second position exists thereby returning to step S71 wherethe similar process is repeated. The result of this being, as shown inFIG. 7, that the thumbnail images created from the photo-images Vthrough Z that were photographed on June 30th, are displayed.

[0144]FIG. 14 is a flow chart that describes one example of the processfor deleting thumbnail images created by the process in FIG. 12 andstored in the buffer memory 35. Since the CPU 36 of the presentembodiment is a low energy consumption type, the electricity is alwayson. Accordingly, even when the power switch 11 is in the OFF position,the CPU 36 is able to execute certain processes.

[0145] The CPU 36, in step S90, determines whether the power switch 11is in the OFF position. The result being that if it is determined to be(NO) that the power switch is not in the OFF position, then the processis completed (END). If it is determined to be (YES) that the powerswitch 11 is in the OFF position, then flow proceeds to step S91.

[0146] In step S91, the CPU 36 makes the initial setting for thevariable i to 1. It then proceeds to step S92 where it deletes thethumbnail image in the ith position from the buffer memory 35. Flow thenproceeds to step S93 where the value of the variable i is increased by 1increment. In step S94, a determination is made as to whether thethumbnail image in the ith position exists. If it is determined to be(YES) that the thumbnail image in the ith position exists, then flowreturns to step S92 where the similar process is repeated. Furthermore,in step S94, if it is determined to be (NO) that the thumbnail image inthe ith position does not exist, then the process is completed (END).

[0147] At this point, the thumbnail images for the photo-images in the22nd position through the 26th position are stored in the buffer memory35 as a result of the process in FIG. 12 being executed. At this time,when the power switch 11 is turned to the OFF position, YES isdetermined to be the case in step S90. In step S92, the thumbnail imagein the first position (the thumbnail image for the photo-image V) thatis stored in the buffer memory 35 is deleted. In step S94, since thethumbnail image in the second position exists, YES is determined to bethe case, and flow returns to step S92 where the similar process isrepeated. The result being that the thumbnail images in the firstthrough the fifth positions (the thumbnail images for the photo-images Vthrough Z shown in FIG. 8) that are stored in the buffer memory 35 aredeleted one after another in turn. Furthermore, the process is completed(END) at the point when the thumbnail image in the fifth position isdeleted.

[0148] According to the processes described above, after turning on thepower, if the input is not completed in more that the prescribed timeperiod, the creation process of the thumbnail images is executed, andthe created thumbnail images are stored in turn into the buffer memory35. In this way, the created thumbnail images are displayed to the LCD 6when the reproduction mode is selected. In addition, when the powerswitch 11 is in the OFF position, the thumbnail images that are storedin the buffer memory 35 are deleted.

[0149] The embodiment described above arranged the creation of onescreen worth or one days worth of thumbnail images. However, embodimentsof the invention may also be arranged to create the thumbnail images ofall of the photo-images that are stored in the memory card 24.

[0150] Thumbnail image generation for successive photography isdescribed hereafter, with reference to FIG. 15. In step S100, adetermination is made as to whether the release switch 10 is pressed. Ifit is not pressed, flow returns to step S100. If the release switch 10is pressed, the value of j is assigned to variable i as the nextphotographic frame number in step S101. In step S102, the ithphotographic frame is taken. Further, in step S103, the value of i isincreased by 1.

[0151] Next, in step S104, a determination is made as to whether thesuccessive photo mode is selected, in other words, whether thesuccessive photo mode switch 13 is switched. In the case that thesuccessive photo mode is selected, then in step S105 a determination ismade as to whether the release switch 10 is continuously being pressed,and if it is determined to be continuously being pressed, the programreturns to step S102 and continues photography.

[0152] On the other hand, if in step S104 it is determined not to be inthe successive photo mode, or if it is determined in step S105 that therelease switch 10 is not being pressed, then the program proceeds tostep S106 where it creates the thumbnail of the frames j through i.However, when it is not in the successive photo mode, the values of jand i are equal.

[0153] According to the process described above, if the successive photomode switch is in the H position, a thumbnail image is created after thesuccessive photography is completed thereby avoiding any decrease in thesuccessive photography speed.

[0154] The information processing apparatus according to aspects of theinvention makes possible the creation of thumbnail images as necessary,reduces the required memory capacity for storing the thumbnail imageswhile making possible the prompt creation of thumbnail images.

[0155] While this invention has been described in conjunction withspecific embodiments thereof, it is evident that many alternatives,modifications and variations will be apparent to those skilled in theart. Accordingly, the preferred embodiments of the invention set forthherein are intended to be illustrative, not limiting. Various changesmay be made without departing from the spirit and scope of the inventionas defined in the following claims.

What is claimed is:
 1. An information processing apparatus comprising:storage means for storing at least one picture image; thumbnail imagecreation means for reducing by a fixed ratio the at least one pictureimage stored in the storage means to create at least one thumbnailimage; control means for controlling the thumbnail image creation means;and output means for outputting to a display the at least one thumbnailimage created by the thumbnail image creation means.
 2. The informationprocessing apparatus of claim 1 , wherein the control means controls thethumbnail image creation means to create only as many of the thumbnailimages as can be simultaneously displayed on one screen of the display.3. The information processing apparatus of claim 1 , wherein the controlmeans controls the thumbnail image creation means to create as many ofthe thumbnail images as can be simultaneously displayed on one screen ofthe display and a prescribed number of additional thumbnail images to benewly displayed on the screen when the screen of said display isscrolled by the prescribed number of images.
 4. The informationprocessing apparatus of claim 1 , wherein the control means controls thethumbnail image creation means to create the at least one thumbnailimage a prescribed time after the image is stored.
 5. The informationprocessing apparatus of claim 1 , wherein the control means controls thethumbnail image creation means to create the at least one thumbnailimage when the apparatus enters a reproduction mode in which the atleast one picture image stored in the storage means is reproduced. 6.The information processing apparatus of claim 1 , wherein the controlmeans controls the thumbnail image creation means to create the at leastone thumbnail image when a power switch of the apparatus is switched tothe ON position.
 7. The information processing apparatus of claim 1 ,wherein the control means controls the thumbnail image creation means tocreate one or more thumbnail images that are to be newly displayed onthe screen when the screen of the display is scrolled.
 8. Theinformation processing apparatus of claim 1 , wherein the control meanscontrols the thumbnail image creation means to create the at least onethumbnail image when a prescribed operation does not occur after aprescribed time period.
 9. The information processing apparatus of claim1 , wherein the control means controls the thumbnail image creationmeans to create the at least one thumbnail image in order starting witheither the newest or the oldest recording date and time of the at leastone picture image.
 10. The information processing apparatus of claim 1 ,wherein the control means controls the thumbnail image creation means tocreate the at least one thumbnail image in the order that thumbnailimages are displayed on the display.
 11. The information processingapparatus of claim 1 , further comprising secondary recording means forrecording the at least one thumbnail image created by the thumbnailimage creation means; and wherein the control means erases the at leastone thumbnail image recorded in the secondary recording means when theapparatus is changed from a reproduction mode, in which the apparatusreproduces the at least one picture image stored in the storage means,to a recording mode in which information is stored in the storage means.12. The information processing apparatus of claim 1 , further comprisingsecondary recording means for recording the at least one thumbnail imagethat was created by the thumbnail image creation means; and wherein thecontrol means erases the at least one thumbnail image recorded in thesecondary recording means when a power switch of the apparatus isswitched to the OFF position.
 13. The information processing apparatusof claim 1 , wherein the display simultaneously displays the at leastone thumbnail image and additional information that is related to thepicture image from which the at least one thumbnail image was created.14. The information processing apparatus of claim 1 , wherein theapparatus is an electronic camera, the apparatus further comprising:photographing means for photographing objects to produce the at leastone picture image; and recording means for recording the at least onepicture image produced by the photographing means in the storage means.15. The information processing apparatus of claim 14 , wherein theapparatus is operable in a successive photo mode in which the object isphotographed successively to produce a series of the picture images, andwherein the control means prohibits the creation of the thumbnail imagesduring successive photography and controls the thumbnail image creationmeans to create thumbnail images subsequent to completing the successivephotography.
 16. An information processing apparatus comprising: amemory in which at least one picture image is stored; a thumbnail imagegenerator coupled to the memory to generate at least one thumbnail imageby reducing the at least one picture image stored in the memory by afixed ratio; a controller coupled to the thumbnail generator to controlthe thumbnail generator; and a display coupled to the thumbnailgenerator to display the at least one thumbnail image generated by thethumbnail generator.
 17. The information processing apparatus of claim16 , wherein the controller controls the thumbnail generator to generateonly as many of the thumbnail images as can be simultaneously displayedon one screen of the display.
 18. The information processing apparatusof claim 16 , wherein the controller controls the thumbnail generator togenerate as many of the thumbnail images as can be simultaneouslydisplayed on one screen of the display and a prescribed number ofadditional thumbnail images to be newly displayed on the screen when thescreen of said display is scrolled by the prescribed number of images.19. The information processing apparatus of claim 16 , wherein thecontroller controls the thumbnail generator to generate the at least onethumbnail image a prescribed time after the image is stored in thememory.
 20. The information processing apparatus of claim 16 , whereinthe controller controls the thumbnail generator to generate the at leastone thumbnail image when the apparatus enters a reproduction mode inwhich the at least one picture image stored in the memory is reproduced.21. The information processing apparatus of claim 16 , wherein thecontroller controls the thumbnail generator to generate the at least onethumbnail image when a power switch of the apparatus is switched to theON position.
 22. The information processing apparatus of claim 16 ,wherein the controller controls the thumbnail generator to generate oneor more thumbnail images that are to be newly displayed on the screenwhen the screen of the display is scrolled.
 23. The informationprocessing apparatus of claim 16 , wherein the controller controls thethumbnail generator to generate the at least one thumbnail image when aprescribed operation does not occur after a prescribed time period. 24.The information processing apparatus of claim 16 , wherein thecontroller controls the thumbnail generator to generate the at least onethumbnail image in order starting with either the newest or the oldestrecording date and time of the at least one picture image.
 25. Theinformation processing apparatus of claim 16 , wherein the controllercontrols the thumbnail generator to generate the at least one thumbnailimage in the order that thumbnail images are displayed on the display.26. The information processing apparatus of claim 16 , furthercomprising a buffer memory in which the at least one thumbnail imagegenerated by the thumbnail generator is stored; and wherein thecontroller erases the at least one thumbnail image recorded in thebuffer memory when the apparatus is changed from a reproduction mode, inwhich the apparatus reproduces the at least one picture image stored inthe memory, to a recording mode in which information is stored in thememory.
 27. The information processing apparatus of claim 16 , furthercomprising a buffer memory in which the at least one thumbnail imagethat was generated by the thumbnail image generator is stored; andwherein the controller erases the at least one thumbnail image recordedin the buffer memory when a power switch of the apparatus is switched tothe OFF position.
 28. The information processing apparatus of claim 16 ,wherein the display simultaneously displays the at least one thumbnailimage and additional information that is related to the picture imagefrom which the at least one thumbnail image was generated.
 29. Theinformation processing apparatus of claim 16 , wherein the apparatus isan electronic camera, the apparatus further comprising: photographingsystem that photographs objects to produce the at least one pictureimage; and a memory controller coupled to the memory to record the atleast one picture image produced by the photographing system in thememory.
 30. The information processing apparatus of claim 29 , whereinthe apparatus is operable in a successive photo mode in which the objectis photographed successively to produce a series of the picture images,and wherein the controller prohibits the generation of the thumbnailimages during successive photography and controls the thumbnail imagegenerator to create thumbnail images subsequent to completing thesuccessive photography.
 31. A method of processing information to createthumbnail images in an information processing apparatus, the methodcomprising the steps of: storing at least one picture image in memory;creating at least one thumbnail image by reducing the at least onepicture image stored in the memory by a fixed ratio; controlling thethumbnail image creation step; and outputting to a display the at leastone thumbnail image.
 32. The method of claim 31 , wherein thecontrolling step controls the thumbnail image creating step to createonly as many of the thumbnail images as can be simultaneously displayedon one screen of the display.
 33. The method of claim 31 , wherein thecontrolling step controls the thumbnail image creating step to create asmany of the thumbnail images as can be simultaneously displayed on onescreen of the display and a prescribed number of additional thumbnailimages to be newly displayed on the screen when the screen of thedisplay is scrolled by the prescribed number of images.
 34. The methodof claim 31 , wherein the controlling step controls the thumbnail imagecreating step to create the at least one thumbnail image a prescribedtime after the image is stored in the memory.
 35. The method of claim 31, wherein the controlling step controls the thumbnail image creatingstep to create the at least one thumbnail image when the apparatusenters a reproduction mode in which the at least one picture imagestored in the memory is reproduced.
 36. The method of claim 31 , whereinthe controlling step controls the thumbnail image creating step tocreate the at least one thumbnail image when a power switch of theapparatus is switched to the ON position.
 37. The method of claim 31 ,wherein the controlling step controls the thumbnail image creating stepto create one or more thumbnail images that are to be newly displayed onthe screen when the screen of the display is scrolled.
 38. The method ofclaim 31 , wherein the controlling step controls the thumbnail imagecreating step to create the at least one thumbnail image when aprescribed operation does not occur after a prescribed time period. 39.The method of claim 31 , wherein the controlling step controls thethumbnail image creating step to create the at least one thumbnail imagein order starting with either the newest or the oldest recording dateand time of the at least one picture image.
 40. The method of claim 31 ,wherein the controlling step controls the thumbnail image creating stepto create the at least one thumbnail image in the order that thumbnailimages are displayed on the display.
 41. The method of claim 31 ,further comprising recording the at least one thumbnail image created bythe thumbnail image creating step in a buffer memory; and wherein thecontrolling step erases the at least one thumbnail image recorded in thebuffer memory when the apparatus is changed from a reproduction mode, inwhich the apparatus reproduces the at least one picture image stored inthe memory, to a recording mode in which information is stored in thememory.
 42. The method of claim 31 , further comprising recording the atleast one thumbnail image that was created by the thumbnail imagecreating step in a buffer memory; and wherein the controlling steperases the at least one thumbnail image recorded in the buffer memorywhen a power switch of the apparatus is switched to the OFF position.43. The method of claim 31 , wherein the displaying step simultaneouslydisplays the at least one thumbnail image and additional informationthat is related to the picture image from which the at least onethumbnail image was created.
 44. The method of claim 31 , wherein theapparatus is an electronic camera, the method further comprising thesteps of: photographing objects to produce the at least one pictureimage; and recording the at least one picture image produced during thephotographing step in the memory.
 45. The method of claim 44 , whereinthe apparatus is operable in a successive photo mode in which the objectis photographed successively to produce a series of the picture images,and wherein the controlling step prohibits the creation of the thumbnailimages during successive photography and controls the thumbnail imagecreating step to create thumbnail images subsequent to completing thesuccessive photography.